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This magnitude
scale introduced recently is
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computed from
seismic moment as
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MW
= 2/3 log10(MO) - 10.7 .
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The
largest reported moments are 2.5´1030 dyn·cm
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for the 1960
Chile earthquake (MS8.5; MW9.6)
and
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7.5´1029
dyn·cm for the 1964 Alaska earthquake
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(MS8.3;
MW9.2).
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